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Solution


Q.

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power:
1 +0.5 D  
2 –0.5 D  
3 +0.2 D  
4 –0.2 D  

Ans.

(2)

The lens of power –0.5 D can be used to correct the defect as:
F=−2m
P=1/f=1/(−2)=−0.5D